/*
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Netscape Communicator source code. 
 *
 * The Initial Developer of the Original Code is
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Mitch Stoltz <mstoltz@netscape.com>
 *
 *   Lan Qiang <jameslan@gmail.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK *****
 */

#ifndef nsZipInputStream_h__
#define nsZipInputStream_h__

#include "nsIInputStream.h"
#include "nsZipFileIO.h"

class nsZipFileIO;
class nsZipInputStream : public nsIInputStream
{
public:
	NS_DECL_ISUPPORTS
	NS_DECL_NSIINPUTSTREAM

	nsZipInputStream() :
		mFd(nsnull), mInSize(0), mCurPos(0), 
		mClosed(PR_FALSE), mInflate(nsnull) { }

	nsresult Init(nsZipFileIO* aZip, nsZipEntryItem *item, PRFileDesc *fd);

private:
	PRFileDesc*   mFd;              // My own file handle, for reading
	PRUint32      mInSize;          // Size in original file 
	PRUint32      mCurPos;          // Current position in input 
	PRPackedBool  mClosed;          // Whether the stream is closed

	struct InflateStruct {
		PRUint32      mOutSize;     // inflated size 
		PRUint32      mInCrc;       // CRC as provided by the zipentry
		PRUint32      mOutCrc;      // CRC as calculated by me
		z_stream      mZs;          // zip data structure
		unsigned char mReadBuf[ZIP_BUFLEN]; // Readbuffer to inflate from
	};
	struct InflateStruct *   mInflate;

	~nsZipInputStream() { Close(); }
	nsresult ContinueInflate(char* aBuf, PRUint32 aCount, PRUint32* aBytesRead);
};

#endif
